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By: Haiduk, Michael W. - Robbins, Lynn W. - Robbins, R. Laurie - Schlitter, Duane A.Type: ArticleIn: Annals of the Carnegie MuseumVolume: 49Series:Issue:Date: 1980-07-07Page Range: 181--191Publication Info: [Pittsburgh], Published by authority of the Board of Trustees of the Carnegie Institute, 1901-Subjects: